Aircraft jet engine



FIG. 1 is a left side elevational view of an aircraft jet engine showing my new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a bottom plan view;

FIG. 5 is a front elevational view;

FIG. 6 is a rear elevational view; and,

FIG. 7 is a front perspective view. 

The ornamental design for an aircraft jet engine, as shown. 